lol at the labour room thing..men!
what I've learnt about the word 'no':
when i did my nursery nurse training we were told not to use the word 'no' as it doesnt explain what they are doing wrong and managing behaviour should involve allowing the child to understand why they shouldnt be doing something and why it may be dangerous, teaching them, this goes the same for the word 'naughty', they are both very negative words, also there is no such thing as naughty (so many people would not agree though lol), children aren't 'bad', children behave in certain ways for reasons i.e. boredom, playing (learning), exploring the world, pushing boundaries with poor parents lol, but obviously the 'no' word still finds its way in, its hard not to use it when a child is about to pour all their juice (mixed with left over sandwich) over the child next to them just before hometime
and it obviously wouldn't do any harm but I can see how this makes sense; explaining and teaching rather than a closed of 'no' is better in the long run for both child and parent, but in no means does it mean using the word 'no' or even 'naughty' is an awful thing!
Obviously with a baby it's
completely different (just like with an older child about to do something really dangerous), you cant really explain at this age and you need them to stop immediately, i think your baby would defenitly understand the tone of your voice and has realised that something interesting happens when he goes near the wires, it's like the dropping toys on the floor and watching adults pick them up time and time again
very fun and interesting for the baby, they learn that their actions can cause others and objects to do certain things.
If you can try to distract him this can sometimes help the cycle, can you get covers for the wires at all? Saying no with a 'serious' tone of voice will let him know it's not allowed but it wont necessarily stop him as you've seen, you may have to keep removing him for a while yet, but distracting may really help you! Also with supervision could you find some bits of cable covering (basically a cable but just the plastic bit), not too long but not too small to be swallowed, put them in a treasure basket; check out this link it explains how to make one and what to include
http://www.peep.org.uk/standard.asp?id=300 , it's basically everyday objects in a basket or box that baby's can explore, baby toys are often plastic and smooth and the textures are boring especially as they feel and explore with their mouthes, objects with different textures are great for sensory creatures like baby's
!
I hope he loses interest in the wires soon
Good luck!
... he stops looks at me sticks out his bottom lip..... then grins and does it again, at which point he gets another no and I move him away....cue tears from the child x 
If you need to get chores done and can't stop him fiddling then pop him in the sling...
